linux-kernel - Re: [PATCH 1/2 V6] intel_pstate: skip this driver if Sun server has

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Date:	Thu, 04 Dec 2014 10:24:26 +0800
From:	ethan zhao <ethan.zhao@...cle.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	Kristen Carlson Accardi <kristen@...ux.intel.com>,
	dirk.j.brandewie@...el.com, linda.knippers@...com,
	viresh.kumar@...aro.org, corbet@....net, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	ethan.kernel@...il.com, Dirk Brandewie <dirk.brandewie@...il.com>
Subject: Re: [PATCH 1/2 V6] intel_pstate: skip this driver if Sun server has
 _PPC method

if could please append

Tested-by: Alexey Kodanev <alexey.kodanev@...cle.com>

He has helped to test this patch on Lenovo machines.

Thanks,
Ethan

On 2014/12/3 10:19, Rafael J. Wysocki wrote:
> On Tuesday, December 02, 2014 10:22:31 AM Kristen Carlson Accardi wrote:
>> On Mon, 1 Dec 2014 11:32:08 +0900
>> Ethan Zhao <ethan.zhao@...cle.com> wrote:
>>
>>> Oracle Sun X86 servers have dynamic power capping capability that works via
>>> ACPI _PPC method etc, so skip loading this driver if Sun server has ACPI _PPC
>>> enabled.
>>>
>>> Signed-off-by: Ethan Zhao <ethan.zhao@...cle.com>
>>> Signed-off-by: Dirk Brandewie <dirk.brandewie@...il.com>
>>> Tested-by: Linda Knippers <linda.knippers@...com>
>> Acked-by: Kristen Carlson Accardi <kristen@...ux.intel.com>
> Patch queued up for 3.19-rc1, thanks!
>
>>> ---
>>>    v2: fix break HP Proliant issue.
>>>    v3: expand the hardware vendor list.
>>>    v4: refine code.
>>>    v5v6: change enum PCC to PPC.
>>>
>>>   drivers/cpufreq/intel_pstate.c | 45 ++++++++++++++++++++++++++++++++++++++----
>>>   1 file changed, 41 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
>>> index 27bb6d3..1bb62ca 100644
>>> --- a/drivers/cpufreq/intel_pstate.c
>>> +++ b/drivers/cpufreq/intel_pstate.c
>>> @@ -943,15 +943,46 @@ static bool intel_pstate_no_acpi_pss(void)
>>>   	return true;
>>>   }
>>>   
>>> +static bool intel_pstate_has_acpi_ppc(void)
>>> +{
>>> +	int i;
>>> +
>>> +	for_each_possible_cpu(i) {
>>> +		struct acpi_processor *pr = per_cpu(processors, i);
>>> +
>>> +		if (!pr)
>>> +			continue;
>>> +		if (acpi_has_method(pr->handle, "_PPC"))
>>> +			return true;
>>> +	}
>>> +	return false;
>>> +}
>>> +
>>> +enum {
>>> +	PSS,
>>> +	PPC,
>>> +};
>>> +
>>>   struct hw_vendor_info {
>>>   	u16  valid;
>>>   	char oem_id[ACPI_OEM_ID_SIZE];
>>>   	char oem_table_id[ACPI_OEM_TABLE_ID_SIZE];
>>> +	int  oem_pwr_table;
>>>   };
>>>   
>>>   /* Hardware vendor-specific info that has its own power management modes */
>>>   static struct hw_vendor_info vendor_info[] = {
>>> -	{1, "HP    ", "ProLiant"},
>>> +	{1, "HP    ", "ProLiant", PSS},
>>> +	{1, "ORACLE", "X4-2    ", PPC},
>>> +	{1, "ORACLE", "X4-2L   ", PPC},
>>> +	{1, "ORACLE", "X4-2B   ", PPC},
>>> +	{1, "ORACLE", "X3-2    ", PPC},
>>> +	{1, "ORACLE", "X3-2L   ", PPC},
>>> +	{1, "ORACLE", "X3-2B   ", PPC},
>>> +	{1, "ORACLE", "X4470M2 ", PPC},
>>> +	{1, "ORACLE", "X4270M3 ", PPC},
>>> +	{1, "ORACLE", "X4270M2 ", PPC},
>>> +	{1, "ORACLE", "X4170M2 ", PPC},
>>>   	{0, "", ""},
>>>   };
>>>   
>>> @@ -966,15 +997,21 @@ static bool intel_pstate_platform_pwr_mgmt_exists(void)
>>>   
>>>   	for (v_info = vendor_info; v_info->valid; v_info++) {
>>>   		if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) &&
>>> -		    !strncmp(hdr.oem_table_id, v_info->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) &&
>>> -		    intel_pstate_no_acpi_pss())
>>> -			return true;
>>> +			!strncmp(hdr.oem_table_id, v_info->oem_table_id,
>>> +						ACPI_OEM_TABLE_ID_SIZE))
>>> +			switch (v_info->oem_pwr_table) {
>>> +			case PSS:
>>> +				return intel_pstate_no_acpi_pss();
>>> +			case PPC:
>>> +				return intel_pstate_has_acpi_ppc();
>>> +			}
>>>   	}
>>>   
>>>   	return false;
>>>   }
>>>   #else /* CONFIG_ACPI not enabled */
>>>   static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; }
>>> +static inline bool intel_pstate_has_acpi_ppc(void) { return false; }
>>>   #endif /* CONFIG_ACPI */
>>>   
>>>   static int __init intel_pstate_init(void)
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